G-SYNC 101: Control Panel

G-SYNC Module

The G-SYNC module is a small chip that replaces the display’s standard internal scaler, and contains enough onboard memory to hold and process a single frame at a time.

The module exploits the vertical blanking interval (the span between the previous and next frame scan) to manipulate the display’s internal timings; performing G2G (gray to gray) overdrive calculations to prevent ghosting, and synchronizing the display’s refresh rate to the GPU’s render rate to eliminate tearing, along with the delayed frame delivery and adjoining stutter caused by traditional syncing methods.


The below Blur Busters Test UFO motion test pattern uses motion interpolation techniques to simulate the seamless framerate transitions G-SYNC provides within the refresh rate, when directly compared to standalone V-SYNC.

G-SYNC Activation

“Enable for full screen mode” (exclusive fullscreen functionality only) will automatically engage when a supported display is connected to the GPU. If G-SYNC behavior is suspect or non-functioning, untick the “Enable G-SYNC, G-SYNC Compatible” box, apply, re-tick, and apply.

Blur Buster's G-SYNC 101: Control Panel

G-SYNC Windowed Mode

“Enable for windowed and full screen mode” allows G-SYNC support for windowed and borderless windowed mode. This option was introduced in a 2015 driver update, and by manipulating the DWM (Desktop Windows Manager) framebuffer, enables G-SYNC’s VRR (variable refresh rate) to synchronize to the focused window’s render rate; unfocused windows remain at the desktop’s fixed refresh rate until focused on.

G-SYNC only functions on one window at a time, and thus any unfocused window that contains moving content will appear to stutter or slow down, a reason why a variety of non-gaming applications (popular web browsers among them) include predefined Nvidia profiles that disable G-SYNC support.

Note: this setting may require a game or system restart after application; the “G-SYNC Indicator” (Nvidia Control Panel > Display > G-SYNC Indicator) can be enabled to verify it is working as intended.

G-SYNC Preferred Refresh Rate

“Highest available” automatically engages when G-SYNC is enabled, and overrides the in-game refresh rate selector (if present), defaulting to the highest supported refresh rate of the display. This is useful for games that don’t include a selector, and ensures the display’s native refresh rate is utilized.

“Application-controlled” adheres to the desktop’s current refresh rate, or defers control to games that contain a refresh rate selector.

Note: this setting only applies to games being run in exclusive fullscreen mode. For games being run in borderless or windowed mode, the desktop dictates the refresh rate.


G-SYNC (GPU Synchronization) works on the same principle as double buffer V-SYNC; buffer A begins to render frame A, and upon completion, scans it to the display. Meanwhile, as buffer A finishes scanning its first frame, buffer B begins to render frame B, and upon completion, scans it to the display, repeat.

The primary difference between G-SYNC and V-SYNC is the method in which rendered frames are synchronized. With V-SYNC, the GPU’s render rate is synchronized to the fixed refresh rate of the display. With G-SYNC, the display’s VRR (variable refresh rate) is synchronized to the GPU’s render rate.

Upon its release, G-SYNC’s ability to fall back on fixed refresh rate V-SYNC behavior when exceeding the maximum refresh rate of the display was built-in and non-optional. A 2015 driver update later exposed the option.

This update led to recurring confusion, creating a misconception that G-SYNC and V-SYNC are entirely separate options. However, with G-SYNC enabled, the “Vertical sync” option in the control panel no longer acts as V-SYNC, and actually dictates whether, one, the G-SYNC module compensates for frametime variances output by the system (which prevents tearing at all times. G-SYNC + V-SYNC “Off” disables this behavior; see G-SYNC 101: Range), and two, whether G-SYNC falls back on fixed refresh rate V-SYNC behavior; if V-SYNC is “On,” G-SYNC will revert to V-SYNC behavior above its range, if V-SYNC is “Off,” G-SYNC will disable above its range, and tearing will begin display wide.

Within its range, G-SYNC is the only syncing method active, no matter the V-SYNC “On” or “Off” setting.

Currently, when G-SYNC is enabled, the control panel’s “Vertical sync” entry is automatically engaged to “Use the 3D application setting,” which defers V-SYNC fallback behavior and frametime compensation control to the in-game V-SYNC option. This can be manually overridden by changing the “Vertical sync” entry in the control panel to “Off,” “On,” or “Fast.”

1460 Comments For “G-SYNC 101”

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NVIDIA recently introduced a new “Max Frame Rate” setting in its Control Panel.
So I’m wondering if that uses the same FPS limiter tested via “Nvidia Inspector” on page 11.
If that’s not the case, when an in-game framerate limiter isn’t available, should I use RTSS or this new setting?
Thanks in advance.


I’ve noticed more and more game now are ditching “Fullscreen exclusive” mode now such as Wow (World of warcraft) and Cod (Call of Duty) cold war and Rust.

One way i verify this is buy moving the volume scroll on my keyboard, and if i see the windows volume overlay appear in game, it’s not full screen exclusive?

Anyway, my main question is, with what i just said in mind, isn’t it better to leave The “Full screen optimizations” box ticked now? So that the DWM bypasses triple buffed v-sync?


Hello there!
First i just want to say thank you so much for all the amazing work you guys do. in-depth analysis and guides like this are really helpful.

I just have a few things that I’m not entirely sure about.

1) You’ve found that G-SYNC completely bypasses the 1 frame of delay add by DWM in windowed/borderless. is that only the case if you’re within the G-SYNC range with V-SYNC enabled? could you still bypass it if you ran G-SYNC with V-SYNC off while being over your monitors refresh rate?

2) is G-SYNC+ V-SYNC off with fps over the monitors refresh rate identical to G-SYNC off + V-SYNC off?
For some reason some games (Apex Legends for example) lock their fps to my monitors refresh rate (120) when i try to disable G-SYNC via the per program settings on the NVCP.
I typically like to disable it for competitive FPS games as i can get much higher FPS than 120.


Hello, I have read a lot, but I have a question.
In my case I play Fortnite, and if I limit the fps to 144 in the game and in the NVCP the screen tearing is not very noticeable, but it happens, otherwise if I play at limited 120 fps the screen tearing is much more noticeable, ( also putting 120hz in the NVCP).
Of course, my fps are not very stable when I get into a fight, they drop from 120 to 100 or a little less.
My question is, do I have to have V-sync activated?
I hope you can answer me


For the best system latency performance using GSYNC for no screen tears with Reflex, should the setup be GSYNC + VSYNC + Reflex + No FPS Cap, or add an FPS Cap under what Reflex auto caps under monitors refresh rate?